--- a/layout/base/nsLayoutDebugger.cpp
+++ b/layout/base/nsLayoutDebugger.cpp
@@ -12,16 +12,17 @@
 
 #include "nsAttrValue.h"
 #include "nsFrame.h"
 #include "nsDisplayList.h"
 #include "FrameLayerBuilder.h"
 #include "nsPrintfCString.h"
 #include "DisplayItemScrollClip.h"
 
+#include <iostream>
 #include <stdio.h>
 
 using namespace mozilla;
 using namespace mozilla::layers;
 
 #ifdef DEBUG
 class nsLayoutDebugger : public nsILayoutDebugger {
 public:
@@ -243,16 +244,35 @@ void
 nsFrame::PrintDisplayList(nsDisplayListBuilder* aBuilder,
                           const nsDisplayList& aList,
                           std::stringstream& aStream,
                           bool aDumpHtml)
 {
   PrintDisplayListTo(aBuilder, aList, aStream, 0, aDumpHtml);
 }
 
+/**
+ * The two functions below are intended to be called from a debugger.
+ */
+void
+PrintDisplayItemToStdout(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem)
+{
+  std::stringstream stream;
+  PrintDisplayItemTo(aBuilder, aItem, stream, 0, true, false);
+  std::cout << stream.str() << std::endl;
+}
+
+void
+PrintDisplayListToStdout(nsDisplayListBuilder* aBuilder, const nsDisplayList& aList)
+{
+  std::stringstream stream;
+  PrintDisplayListTo(aBuilder, aList, stream, 0, false);
+  std::cout << stream.str() << std::endl;
+}
+
 #ifdef MOZ_DUMP_PAINTING
 static void
 PrintDisplayListSetItem(nsDisplayListBuilder* aBuilder,
                         const char* aItemName,
                         const nsDisplayList& aList,
                         std::stringstream& aStream,
                         bool aDumpHtml)
 {